OP
What Is Optical Profilometry (OP)?
Optical Profilometry (OP) is a non-contact surface metrology technique that measures 3D surface topography using optical methods (commonly interferometry-based). It generates 2D/3D surface maps, calculates roughness parameters, and can quantify step heights and feature dimensions—all without physically touching the surface.
Key advantages
Non-contact & non-destructive for most samples
Produces 3D topography plus roughness and dimensional metrics
Well-suited for coatings, thin films, wear scars, and delicate surfaces (project-dependent)
What OP Is Used For
Optical Profilometry is commonly used to evaluate:
Surface roughness & texture (Ra, Rq, Sa, Sq, etc.—reported per project need)
Step height and film/coating thickness variation (uniformity checks)
Flatness, waviness, curvature (metrology and process monitoring)
Wear volume / wear scar geometry in tribology studies (project-dependent)
Defects such as pits, scratches, orange peel, and local surface damage (project-dependent)
Why Optical Profilometry (vs. Stylus/Contact Methods)?
Compared with contact profilometers, OP can offer:
No tip-induced damage on soft or delicate materials
Faster area mapping (surface scans over defined fields of view)
True 3D information (not only a single line profile)
Helpful for soft polymers, thin coatings, and microfeatures where contact methods may distort results (project-dependent)
Sample Types We Support
OP is commonly applied to (project-dependent):
Coatings & thin films: paint, hard coatings, protective layers, functional films
Metals & alloys: machined surfaces, corrosion attack morphology, surface treatments
Polymers & plastics: molded parts, films, textured surfaces
Semiconductors & electronics: wafers/coupons, film steps, process marks (project-dependent)
Tribology samples: wear tracks, bearings, counterface scars (project-dependent)
Typical Workflows
Roughness & Texture Characterization
Best for: process control, surface finish qualification
Define scan area(s) and roughness parameters
Report roughness metrics + 3D maps
Optional: multiple locations for uniformity (project-dependent)
Step Height / Feature Measurement
Best for: coating steps, etched features, wear depth
Step height and profile extraction
Feature width/geometry measurements (where applicable)
Comparative Study (“What Changed?”)
Best for: supplier/process changes, before/after aging or treatment
Same scan plan on reference vs suspect samples
Side-by-side comparison of maps and key metrics
Practical summary of statistically meaningful differences (project-dependent)
What You Receive
3D surface maps (and selected 2D profiles)
Roughness parameter table and measurement settings
Feature/step height results (if included)
Clear conclusions for: pass/fail, trend, or comparison (depending on your goal)
Sample Submission Guidelines
Please provide
Material type and surface description (coating? polished? textured?)
Your goal: roughness, step height, wear volume, defect characterization, comparison
Any spec limits (target Ra/Sa, step height tolerance, etc.)
If comparison-based: reference/control sample is strongly recommended
Packaging tips
Protect surfaces from fingerprints, rubbing, and dust (gloves + clean bags)
Mark areas of interest and orientation (top/bottom, flow direction, etc.)
For wear tracks, label contact direction and test conditions (if available)
FAQs
Is OP destructive?
Generally non-destructive because it does not touch the surface, but the sample may still require handling/fixturing.
Can OP measure coating thickness?
OP can measure step height or thickness variation when there is a measurable step/edge or exposed substrate reference (project-dependent).
How is OP different from AFM?
AFM offers very high-resolution nanoscale scans over smaller areas; OP typically covers larger areas faster with excellent vertical sensitivity (project-dependent choice based on your feature size and throughput needs).
Can OP quantify wear volume?
Often yes for defined wear scars/tracks by integrating the 3D geometry (project-dependent).
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